I had left my laptop closed but on for awhile, but it didn't over heat or anything. I opened back up and it looked like it had shut-down, so I hit the power button. It looked like it was booting up like normal and then it went to a screen that said "A disk read error occurred" and to press ctrl alt del, to restart. I did that many times and it just keeps doing that time after time. Someone please tell me that the problem isn't nearly as bad as I think it is, and please tell me how I can fix it. I don't want to lose any of my stuff, because I don't have a back-up on most of it.